<ul><li>useCallback is a React Hook that helps optimize components by memoizing callback functions, ensuring the function reference stays the same unless dependencies change.</li><li>It prevents unnecessary re-renders or re-executions of child components' useEffect hooks when passing functions as props to child components.</li><li>useCallback syntax: const memoizedCallback = useCallback(() => { // Your logic here }, [dependencies]);</li><li>It is commonly used when passing functions as props to child components, optimizing performance and preventing expensive computations caused by frequent re-creation of the same function.</li></ul>

What is 'useCallback' in React?

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